General 1st time android user questions

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http://androidforums.com – So I switched from an iphone to a S3. WOW! I feel so free to choose everything! My iphone was good at what it did just not me in anyway shape or form. Love it so far, but do have questions. Battery: Obviously I'm still setting it up so lots of heavy usage. I've installed go launcher and like that, different widgets, keyboard, icons etc. After looking through all the various ones I think I've settled on what I like. Should I delete the other widgets not being used? Do they still run in the background? Icon apps etc? Example, I'm not using go weather, does it still update all the time or (General)